9118259c1d
The pmu_events array requires 15 pointers per entry which in position independent code need relocating. Change the array to be an array of offsets within a big C string. Only the offset of the first variable is required, subsequent variables are stored in order after the \0 terminator (requiring a byte per variable rather than 4 bytes per offset). The file size savings are: no jevents - the same 19,788,464bytes x86 jevents - ~16.7% file size saving 23,744,288bytes vs 28,502,632bytes all jevents - ~19.5% file size saving 24,469,056bytes vs 30,379,920bytes default build options plus NO_LIBBFD=1. For example, the x86 build savings come from .rela.dyn and .data.rel.ro becoming smaller by 3,157,032bytes and 3,042,016bytes respectively. .rodata increases by 1,432,448bytes, giving an overall 4,766,600bytes saving. To make metric strings more shareable, the topic is changed from say 'skx metrics' to just 'metrics'. To try to help with the memory layout the pmu_events are ordered as used by perf qsort comparator functions. Signed-off-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: John Garry <john.garry@huawei.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Leo Yan <leo.yan@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mike Leach <mike.leach@linaro.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Bangoria <ravi.bangoria@amd.com> Cc: Stephane Eranian <eranian@google.com> Cc: Will Deacon <will@kernel.org> Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com> Cc: linux-arm-kernel@lists.infradead.org Link: https://lore.kernel.org/r/20220812230949.683239-14-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.